PPT-Natural radio activity and the laws of radioactive transfor

Fourth lecture Discovery of radio activity Radioactivity was the first nuclear phenomenon to be discovered the credit for this discovery goes to the French physicist Henri Becquerel 1896 Radioactivity . What can be Patented . What can be patented . A patent is granted to anyone who “invents or discovers any . new. and . useful. . process, machine, manufacture, or composition of matter. , or any . S. ources associated with. Broad Absorption Line . Q. uasars. Takayuki HAYASHI (. Univ. of . Tokyo, NAOJ). A member of AGN WG in SKA-. jp. A. DOI . (ISAS/JAXA), . H. . NAGAI . (NAOJ). G. . Bruni. Jim Hartnett. PHYS 3305. Radioactive Decay - Jim Hartnett. 1. What is it?. Macroscopic Effects. Types of Decay. The Decay Chain. Fission. Radioactive Decay - Jim Hartnett. 2. Radioactive Decay. A nucleus may be bound in a relatively high energy state, and if it can attain a lower energy, it will eventually do so. Definitions and types of decay. Derivation . of decay . e. quations. Half l. ives and mean lives. Secular . Equilibrium. Useful . radiotracers . in . oceanography. E & H . Chpt. 5. The chart of the nuclides - decay. The basic outline of my story: There are 3 boys and 1 girl who all know each other. The world has been threatened by nuclear war. . Everyone thinks . that there is a refugee camp in London. There on their way there when a man called Andy befriends them and turns out to be a nasty man... radiation … radioactive material. What are they? . exposure … contamination. Are they the same?. Radioactivity. Spontaneous emission of radiation from the nucleus of an unstable isotope. Disintegration Decay. Nuclear Stability . Nuclear stability . means that nucleus is stable meaning . that it . does not spontaneously emit any kind of radioactivity (radiation). . On the other hand, . if the . nucleus is unstable (not stable), it has the tendency of emitting some kind of . Background Image courtesy of Dr. Bill Moore, Dept. of Radiology, Stony Brook Hospital. http://www.colin-studholme.net/research/ipag/mrdspect/mrspect3.html. http://www.mwit.ac.th/~Physicslab/applet_04/atom2/Alphae.gif. What are they? . exposure … contamination. Are they the same?. Radioactivity. Spontaneous emission of radiation from the nucleus of an unstable isotope. Disintegration Decay. Demonstrate Decontamination. Princeton UniversityInitial Radiation Safety Training, Health Physics Society, Environmental Protection Agency,Environmental Protection Agency, Links to external resources are p 53 1 Bq = 1 disintegration per sec. The accepted practice is to give the activity of a radioactive source in becquerel. This is because Bq is the unit chosen for the system of international units ( becquerel. (. Bq. ), in honor of the scientist Henri Becquerel. One . Bq. is defined as one transformation, decay, or disintegration per second. Since sensible sizes of radioactive material contain many atoms, a . 1) Sign in. Print name legibly.. 2) Complete a ‘Radiation Worker Registration Form’, via:. . www.umaryland.edu. /ehs. 3) Complete online exam via . MyEHS. > Online Training > Radiation Safety. Where: . A . = Activity after some time t.. A. o. . = Original activity of the sample.. t . = Decay time . λ = the radioactive decay constant equal to . The half-life equation can be also used for activity, simply by replacing the number of atoms .